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Re: bootstrap, was What is the oldest computer that could be used today for real work? [message #411426 is a reply to message #411414] Thu, 30 September 2021 15:16 Go to previous messageGo to previous message
Anne & Lynn Wheel is currently offline  Anne & Lynn Wheel
Messages: 3156
Registered: January 2012
Karma:
Senior Member
Dan Espen <dan1espen@gmail.com> writes:
> I think that was characteristic of OS/VS.
>
> DOS and DOS/VS managed a minute or 2.
>
> The IBM 1401 booted just about the same as the other machines mentioned.
> Clear 1-80, read a card into 1-80, branch to 1.
>
> Unlike the S/360, I don't remember any way to make a 1401 boot from
> other media.

CP/67 and VM/370 came up in several seconds. Early on CP/67 (that
carried over to VM/370) for being up 7/24 dark room with no operator.
There was even special handling for system crash, automatically take
dump core image ... and automagically re-ipl and be back up and running.

Also back to days when all IBM mainframes were rented and charges based
on "system meter" reading that ran whenever the CPU and/or any channel
was running ... CP/67 developed special channel programs that let
channel go idle but would immediately wake-up for any characters
arriving on a line ... to reduce offshift, light load costs
(and help encourage leaving system up and available 7x24, also
goes for running w/o an operator/human present).

All activity had to be idle for 400ms before "system meter" would
actually stop running. Note: long after IBM had switched mainframes from
lease/rent to sales ... MVS (VS/2) still had a timer task that woke up
every 400ms (to guarantee that system meter never stopped)


--
virtualization experience starting Jan1968, online at home since Mar1970
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